#include<stdio.h>
enum WEEKDAY
{
  SUNDAY,
  MONDAY,
  TUESDAY,
  WEDNESDAY,
  THURSDAY,
  FRIDAY,
  SATURDAY
};
int main()
{
    enum WEEKDAY day=WEDNESDAY;//自定义枚举类型，系统没有提供
    printf("%d\n",day);
    return 0;
}